﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using IService;
using System.IO;

namespace Service
{
    public class PasswordService : IPasswordService
    {
       public PasswordService()
       { }
        //MD5加密
       public string MD5Encrypt(string pToEncrypt, string sKey)
       {
           DESCryptoServiceProvider des = new DESCryptoServiceProvider();
           byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
           des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
           des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
           MemoryStream ms = new MemoryStream();
           CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
           cs.Write(inputByteArray, 0, inputByteArray.Length);
           cs.FlushFinalBlock();
           StringBuilder ret = new StringBuilder();
           foreach (byte b in ms.ToArray())
           {
               ret.AppendFormat("{0:X2}", b);
           }
           ret.ToString();
           return ret.ToString();


       }

       ///MD5解密
       public string MD5Decrypt(string pToDecrypt, string sKey)
       {
           DESCryptoServiceProvider des = new DESCryptoServiceProvider();

           byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
           for (int x = 0; x < pToDecrypt.Length / 2; x++)
           {
               int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
               inputByteArray[x] = (byte)i;
           }

           des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
           des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
           MemoryStream ms = new MemoryStream();
           CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
           cs.Write(inputByteArray, 0, inputByteArray.Length);
           cs.FlushFinalBlock();

           StringBuilder ret = new StringBuilder();

           return System.Text.Encoding.Default.GetString(ms.ToArray());
       }
    }
}
